Hello, I am new here and created an account to ask for help and advice on caring for my male halfmoon betta, Fishy. I purchased him from a pet store about thirteen months ago along with a female veiltail betta. Both live in seperate 1/2 gallon tanks, and while the veiltail is currently behaving normally, my poor Fishy seems sick. His fins have been deteriorating for about six months and they are nearly gone now. He also has been eating very little for roughly the same time frame. I've been wondering if he is blind, as sometimes a piece of food will be right in front of him and he will let it fall to the bottom of the tank without chasing after it. For the past few months he has been very inactive and he has mostly just sat at the top of his tank and laid on his side, however, as of a few days ago it looks like he has been trying to swim around more. What is wrong with my little guy? I am by no means a betta expert and really just want to know how to help my little Fishy. Is he suffering right now? If more information is needed to help identify what is wrong with him, don't hesitate to ask.
Here is a picture of Fishy now. I have additional pictures but cannot figure out how to add more than one picture per post, so I will post them a little later.
Thank you for your help!